Mobile device

1. A mobile device comprising: a drive element; a first battery which outputs power; a supplying unit which supplies the power output by the first battery or power output by a second battery to the drive element; and a booster unit which boosts a voltage of the first battery to a first drive voltage that is lower than a voltage of the second battery when the voltage of the second battery is greater than or equal to a first voltage for driving the drive element, wherein the supplying unit prioritizes supplying of the power output by the second battery to the drive element over the power output by the first battery, and the supplying unit supplies the power output by the second battery to the drive element when the voltage of the second battery is greater than or equal to the first voltage.

2. The mobile device according to claim 1 , wherein the second battery is attachable and detachable with respect to the mobile device.

3. The mobile device according to claim 1 , wherein the booster unit boosts the voltage of the first battery to a second drive voltage that is greater than or equal to the first voltage when the voltage of the second battery is less than the first voltage, and the supplying unit supplies the power output by the first battery to the drive element when the voltage of the second battery is less than the first voltage.

4. The mobile device according to claim 1 , wherein a maximum capacity of the second battery is greater than a maximum capacity of the first battery.

5. The mobile device according to claim 1 , wherein the voltage of the first battery is lower than the first voltage, the supplying unit includes a node shared by a first path through which power is supplied from the first battery to the drive element and a second path through which power is supplied from the second battery to the drive element, and a diode provided on the first path, an anode of the diode being electrically coupled to the booster unit and a cathode of the diode being electrically coupled to the node, and the booster unit is provided on the first path.

6. The mobile device according to claim 5 , wherein the node is bus wiring.

7. The mobile device according to claim 1 , wherein the drive element includes a notification unit which performs notification of a capacity of the second battery.

8. The mobile device according to claim 1 , further comprising: a first processor which controls the drive element; and power wiring which electrically couples the first processor, the first battery, and the second battery to one another, wherein a wiring length between the first processor and the first battery in the power wiring is shorter than a wiring length between the first processor and the second battery in the power wiring, and a wiring length between the second battery and the first battery in the power wiring is shorter than a wiring length between the second battery and the first processor in the power wiring.

9. The mobile device according to claim 1 , further comprising: a first processor which controls the drive element; and a second processor having a smaller power consumption than the first processor, wherein a sum of a distance between the first processor and the first battery and a distance between the first processor and the second battery is greater than a sum of a distance between the second processor and the first battery and a distance between the second processor and the second battery.